Sahih Muslim
Sahih Muslim 319 a
The amount of water with which it is recommended to perform ghusl in the case of janabah; a man and woman washing from a single vessel; one of them washing with the left-over water of the other
Arabic hadith text
حَدَّثَنَا يَحْيَى بْنُ يَحْيَى، قَالَ قَرَأْتُ عَلَى مَالِكٍ عَنِ ابْنِ شِهَابٍ، عَنْ عُرْوَةَ بْنِ الزُّبَيْرِ، عَنْ عَائِشَةَ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم كَانَيَغْتَسِلُ مِنْ إِنَاءٍ هُوَ الْفَرَقُ مِنَ الْجَنَابَةِ .
Translation
'A'isha reported
The Messenger of Allah (ﷺ) washed himself with water from a vessel (measuring seven to eight seers) because of sexual intercourse.